Expansion of log(1+tan(x)*x).A009379Expansion of log(1+tan(x)*x).Terms a(0) =0a(1) =2a(2) =-4a(3) =96a(4) =-2080a(5) =125440a(6) =-8629248a(7) =996007936a(8) =-140162633728External referencesoeis: A009379